A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ParthKohli

  • one year ago

two numbers are randomly chosen from 1, 3, 5, 7, ..., 145, 147, 149

  • This Question is Closed
  1. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    in how many ways can they be chosen so that we have their product divisible by 5?

  2. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Total numbers: 75. Numbers divisible by 5: 15. Case-I: One number and only one number of the two chosen ones is divisible by 5. \(15\) numbers divisible by 5 and \(60 \) numbers that are not. Thus there are \(15\cdot 60= 900\) such pairs. Case-II: Both numbers divisible by 5.\[\binom{15}{2}=105\]Total numbers: 1005.

  3. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The given answer is 1020. Am I missing something?

  4. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \(\color{white}{bookmark}\)

  5. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oooh, goddammit. you know what, the original question has a list that goes up to 151 :P

  6. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    in that case, divisible by 5: 15... total: 76

  7. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so I'm right in a way. I just read the list till 149 lol

  8. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.